

package com.hazelcast.client.impl.protocol.codec.builtin;

import com.hazelcast.client.impl.protocol.ClientMessage;

import java.util.*;

import static com.hazelcast.client.impl.protocol.codec.builtin.FixedSizeTypesCodec.*;

public final class EntryListUUIDUUIDCodec {

    private static final int ENTRY_SIZE_IN_BYTES = UUID_SIZE_IN_BYTES + UUID_SIZE_IN_BYTES;

    private EntryListUUIDUUIDCodec() {
    }

    public static void encode(ClientMessage clientMessage, Collection<Map.Entry<UUID, UUID>> collection) {
        int itemCount = collection.size();
        ClientMessage.Frame frame = new ClientMessage.Frame(new byte[itemCount * ENTRY_SIZE_IN_BYTES]);
        Iterator<Map.Entry<UUID, UUID>> iterator = collection.iterator();
        for (int i = 0; i < itemCount; i++) {
            Map.Entry<UUID, UUID> entry = iterator.next();
            encodeUUID(frame.content, i * ENTRY_SIZE_IN_BYTES, entry.getKey());
            encodeUUID(frame.content, i * ENTRY_SIZE_IN_BYTES + UUID_SIZE_IN_BYTES, entry.getValue());
        }
        clientMessage.add(frame);
    }

    public static List<Map.Entry<UUID, UUID>> decode(ClientMessage.ForwardFrameIterator iterator) {
        ClientMessage.Frame frame = iterator.next();
        int itemCount = frame.content.length / ENTRY_SIZE_IN_BYTES;
        List<Map.Entry<UUID, UUID>> result = new ArrayList<>(itemCount);
        for (int i = 0; i < itemCount; i++) {
            UUID key = decodeUUID(frame.content, i * ENTRY_SIZE_IN_BYTES);
            UUID value = decodeUUID(frame.content, i * ENTRY_SIZE_IN_BYTES + UUID_SIZE_IN_BYTES);
            result.add(new AbstractMap.SimpleEntry<>(key, value));
        }
        return result;
    }
}
